Which sound device(s) does Coleridge use in Line 25 below to create a musical effect?

"Five miles meandering with a mazy motion"

1. onomatopoeia
2. assonance
3. consonance
4. alliteration

The Technique that Coleride uses in his line is "Alliteration".

Explanation:

Alliteration means the occurrence of the same letter or sound at the beginning of adjacent or closely connected words.Hence the musical effect is achieved by the usage of the letter "m" to create a musical effect.

The sound device used to create a musical effect in the lines “Five miles meandering with a mazy motion" is “consonance”.

Explanation:  

Consonance is the repetitive sounds of consonants in a given line, which may or may not be placed in succession with each other.  

Alliteration are the age old tongue twisters which have same consonants sounds in the beginning of almost each words.

Assonance is where the vowel sounds get repeated in the concerned line, which makes it more rhythmic.

Onomatopoeia is where the sound of the word is the same as the actual happening of the action, such as “slam, puff’ etc.”

Hence regarding the above, consonance becomes the most appropriate sound device for the lines given.